importer/flickr: make test data for devcam

A few renamings in flickr.go too.

http://camlistore.org/issue/417

Change-Id: Ied28cfadc7a546f34b87f9a43462f82ee4cb71d6
Merge "importer/flickr: make test data for devcam"
picasa: simplify photo import code, only redownload photo when necessary, do 3 at once.

Change-Id: I99551ad90359ced164b47b12f121ef207b797430
Merge branch 'master' of https://camlistore.googlesource.com/camlistore